formula for gravitational acceleration at a distance d from centre
g' = g(1 - d/R)
g = 9.81 m/s2
g' = 9.81(1 - 1505/6371)
= 7.48 m/s2
so the gravitational acceleration inside the earth is 7.48 m/s2
Assume the Earth is a uniform density sphere with mass M- 5.972x1024 kg and radius R-6371...
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